If it's a new setup, I think there is a prompt for installing other drivers (F8 or something to press immediately in the new setup). Then you insert the installation CD or whatever that came with your hard drive or controller card.
If it's an existing setup, either run the CD setup program or go into Device Manager, and right click on the entry with a yellow "?," where you hit "Update Driver." Then insert your CD or whatever when prompted.
I think that's right...
Melon